EP1143024B1 - Martensitic stainless steel - Google Patents
Martensitic stainless steel Download PDFInfo
- Publication number
- EP1143024B1 EP1143024B1 EP99959849A EP99959849A EP1143024B1 EP 1143024 B1 EP1143024 B1 EP 1143024B1 EP 99959849 A EP99959849 A EP 99959849A EP 99959849 A EP99959849 A EP 99959849A EP 1143024 B1 EP1143024 B1 EP 1143024B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- content
- less
- stainless steel
- corrosion resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
Definitions
- the present invention relates to a martensitic stainless steel suitable for pipelines or the like which are used under environments containing both moist carbon dioxide gas and moist hydrogen sulfide.
- JP-A-6-100943 the term "JP-A-" referred to herein signifies "Unexamined Japanese Patent Publication"
- JP-A-4-268018 JP-A-8-100235
- JP-A-8-100236 Other martensitic stainless steels with low C content and Mo content around 2.0 but with no W are described in JP-A-9-291344, JP-A-8-41599, WO 96/03532 and JP-A-10-25549,
- JP-A-9-291344 JP-A-8-41599, WO 96/03532 and JP-A-10-25549
- JP-A-9-291344 JP-A-8-41599
- WO 96/03532 JP-A-10-25549
- WO 96/21747 proposes martensitic stainless steels containing Mo or Mo and W but having a much larger content of C (0.15-0.40 %). Hence these steels cannot be used for pipelines under moist carbon dioxide of hydrogen sulfide environments as Mo and W are strong carbide former elements.
- An object of the present invention is to provide a martensitic stainless steel applicable under environments containing both moist carbon dioxide gas and moist hydrogen sulfide, and having excellent field welding performance.
- the inventors of the present invention carried out various investigations on the components of martensitic stainless steel, and obtained the following-given findings
- the inventors of the present invention have developed a martensitic stainless steel consisting of 0.02% or less C, 0.02% or less N, 0.1 to 0.3% Si, 0.1 to 0.3% Mn, 10 to 13% Cr, 5 to 8% Ni, 1.5 to 3% Mo, 0.1 to 3% W, further optionally one or both of 0.01 to 0.1% Ti and Nb, and optionally 0.1 to 3% Cu, by weight, and the balance of Fe and inevitable impurities, and satisfying 0.02 to 0.04% (C + N) by weight.
- the object of the present invention can be achieved also by a martensitic stainless steel consisting of 0.02% or less C, 0.02% or less N, 0.1 to 0.3% Si, 0.1 to 0.3% Mn, 10 to 13% Cr, 5 to 8% Ni, 1.5 to 3% Mo, 0.1 to 3% W, further one or both of 0.01 to 0.1% Ti and Nb, and optionally 0.1 to 3% Cu, by weight, and the balance of Fe and inevitable impurities, and satisfying 0.02 to 0.04% (C + N) by weight.
- a martensitic stainless steel consisting of 0.02% or less C, 0.02% or less N, 0.1 to 0.3% Si, 0.1 to 0.3% Mn, 10 to 13% Cr, 5 to 8% Ni, 1.5 to 3% Mo, 0.1 to 3% W, further one or both of 0.01 to 0.1% Ti and Nb, and optionally 0.1 to 3% Cu, by weight, and the balance of Fe and inevitable impurities, and satisfying 0.02 to 0.04% (C + N) by weight
- Nitrogen combines with Cr to form a compound, thus reducing the amount of Cr which is effective in corrosion resistance, and increases the hardness at the HAZ. Consequently, the N content is specified to 0.02 wt.% or less.
- Silicon is added as a deoxidizer.
- the Si content of not more than 0.1 wt.% gives no effect of deoxidization.
- the Si content of more than 0.3 wt.% induces crystallization of delta ferrite, then an additional Ni amount are needed to maintain the phase balance. Therefore, the Si content is specified to a range of from 0.1 to 0.3 wt.%.
- Manganese is added as a desulfurizer.
- the Mn content of not more than 0.1 wt.% gives no effect of desulfurization, and degrades hot workability.
- the Mn content of more than 0.3 wt.% degrades the corrosion resistance under an environment containing carbon dioxide and hydrogen sulfide. Accordingly, the Mn content is specified to a range of from 0.1 to 0.3 wt.%.
- Chromium is an element which is effective to improve the corrosion resistance under an environment containing moist carbon dioxide gas.
- less than 10 wt.% of Cr content cannot attain the effect.
- the corrosion resistance increases.
- Cr is a powerful element to produce ferrite, if the Cr content exceeds 13 wt.%, surplus addition of Ni which is an expensive element to produce austenite is required. Consequently, the Cr content is specified to a range of from 10 to 13 wt.%.
- Ni is an element necessary to form a martensitic structure, less than 5 wt.% of Ni content degrades toughness and corrosion resistance owing to generating a large quantity of ferritic phase. If the Ni content exceeds 8 wt.%, the economy degrades. Therefore, the Ni content is specified to a range of from 5 to 8 wt.%.
- Molybdenum is an effective element to attain corrosion resistance. However, less than 1.5 wt.% of Mo content gives insufficient effect. If Mo is added over 3 wt.%, addition of expensive Ni is required because Mo is an element to generate ferrite.
- the amount of (C + N) is 0.02 wt.% or more to attain an aimed strength, and is not more than 0.04 wt.% to control the hardness at the HAZ.
- Each of W and Cu is an element effective to attain strength and corrosion resistance. Addition of W or Cu to less than 0.1 wt.% does not attain sufficient effect, and, to over 3 wt.% degrades the hot workability. Accordingly, the content of W and Cu is specified to a range of from 0.1 to 3 wt.%.
- Each of Ti and Nb forms a carbide with C in steel, and refines grains to improve the strength and toughness. Addition of Ti or Nb to less than 0.01 wt.% does not attain sufficient effect, and, to over 0.1 wt.% saturates the effect. Consequently, the content of Ti and Nb is specified to a range of from 0.01 to 0.1 wt.%.
- the steels with the components adjusted as described above according to the present invention are stable in their mechanical characteristics against variations of production conditions such as heat treatment.
- the steels according to the present invention may be prepared by melting using adequate methods such as converter, electric furnace, or combination of them, if only the components thereof are adjusted to a specified range. After prepared by melting, the steels are formed in billets and slabs by a continuous casting machine or a mold, then are worked into a specified shape such as steel pipes and steel plates by hot-rolling, followed by applying heat treatment to attain an aimed strength. After established a martensitic structure by a heat treatment, the steels are preferred to be subjected to a tempering to adjust the strength thereof.
- Steels A through Q having respective chemical compositions given in Table 1 were prepared by melting in a vacuum melting furnace. Each of the steels was hot-rolled to a steel plate having 12 mm in thickness. The steel plate was quenched by water from 900°C ⁇ 10°C, and then tempered at 640°C ⁇ 5°C to obtain aimed proof stresses of from 600 to 700 MPa. For each of thus prepared steel plates, the corrosion resistance and the field welding performance described below were tested.
- the corrosion resistance to a moist carbon dioxide gas was evaluated in terms of plate thickness loss by immersing a steel plate in a solution of 5% NaCl-30atmCO 2 at 180°C for 96 hours. If the corrosion rate converted to one-year value is not more than 0.3 mm/y, no practical application problem occurs.
- the corrosion resistance to a moist hydrogen sulfide was evaluated in terms of presence/absence of fracture on the steel plate by the stress corrosion crack test for a sulfide, (Resistant SSC test) of TM0177 specified by NACE. That is, a steel plate was immersed in an aqueous solution of 5%NaCl+0.5%acetic acid saturated with 1atmH 2 S for 720 hours while applying a load of 60% of the proof stress. If no fracture occurs under the test, no practical application problem occurs.
- the field welding performance was evaluated by the hardness at a reproduced HAZ section. If the hardness is not more than 350 Hv, no preheating and postheating treatment are required.
- the steels C, G, H and J which are the Example Steels according to the present invention, gave 600 to 700 MPa of proof stress, 0.3 mm/y or less of corrosion rate in a moist carbon dioxide gas, and 350 Hv or less of hardness, giving no fracture in a moist hydrogen sulfide, being applicable in an environment containing both a moist carbon dioxide gas and a moist hydrogen sulfide, giving excellent field welding performance, thus showing adaptability to pipelines.
- the Comparative Steel K contained less amount of Cr content and showed no sufficient corrosion resistance to a moist carbon dioxide.
- the Comparative Steel L contained large amount of Si which is a deoxidizer
- the Comparative Steel M contained large amount of Mn as a desulfurizer
- the Comparative Steel N contained less amount of Mo, so that these comparative steels were inferior in corrosion resistance to a moist hydrogen sulfide.
- the Comparative Steel O contained less amount of Ni, so a delta ferrite deposited, which degraded the corrosion resistance to a moist carbon dioxide gas.
- the Comparative Steel P contained less amount of (C + N), and failed to attain satisfactory strength.
- the Comparative Example Q contained large amount of C and N, so that the strength was high and that the field welding performance was inferior.
Description
- Chromium is effective in corrosion resistance to an acid in a moist carbon dioxide gas.
- To prevent occurrence of sulfide stress corrosion cracking in an environment containing moist hydrogen sulfide, the suppression of quantity of invading hydrogen into the steel is required. To do this, it is effective to add a certain amount of Mo along with Cr, and further to reduce the amount of desulfurization and deoxidization elements.
- Control of C and N amount is effective to improve the welding and production performance.
- Tungsten reveals a remarkable increase in proof stress and excellent corrosion resistance in moist carbon dioxide gas.
Steel | Proof stress (MPa) | Corrosion in a moist carbon dioxide gas (mm/y) | Presence/absence of fracture in a moist hydrogen sulfide gas | Hardness (Hv) | Remark |
A | 625 | 0.11 | Absent | 315 | Reference Steel |
B | 690 | 0.15 | Absent | 316 | Reference Steel |
C | 684 | 0.08 | Absent | 314 | Example Steel |
D | 630 | 0.05 | Absent | 320 | Reference Steel |
E | 622 | 0.14 | Absent | 310 | Reference Steel |
F | 625 | 0.20 | Absent | 320 | Reference Steel |
G | 644 | 0.12 | Absent | 318 | Example Steel |
H | 651 | 0.18 | Absent | 315 | Example Steel |
I | 614 | 0.22 | Absent | 314 | Reference Steel |
J | 660 | 0.15 | Absent | 325 | Example Steel |
K | 602 | 0.75 | Absent | 321 | Comparative Example Steel |
L | 622 | 0.15 | Present | 313 | Comparative Example Steel |
M | 618 | 0.14 | Present | 315 | Comparative Example Steel |
N | 613 | 0.21 | Present | 312 | Comparative Example Steel |
O | 656 | 0.42 | Absent | 309 | Comparative Example Steel |
P | 575 | 0.16 | Absent | 297 | Comparative Example Steel |
Q | 720 | 0.23 | Absent | 380 | Comparative Example Steel |
Claims (2)
- A martensitic stainless steel consisting of 0.02% or less C, 0.02% or less N, 0.1 to 0.3% Si, 0.1 to 0.3% Mn, 10 to 13% Cr, 5 to 8% Ni, 1.5 to 3% Mo, 0.1 to 3% W, further optionally one or both of 0.01 to 0.1% Ti and Nb, and optionally 0.1 to 3% Cu, by weight, and the balance of Fe and inevitable impurities, and satisfying 0.02 to 0.04% (C + N) by weight.
- A martensitic stainless steel according to claim 1, consisting of 0.02% or less C, 0.02% or less N, 0.1 to 0.3% Si, 0.1 to 0.3% Mn, 10 to 13% Cr, 5 to 8% Ni, 1.5 to 3% Mo, 0.1 to 3% W, further one or both of 0.01 to 0.1% Ti and Nb, and optionally 0.1 to 3% Cu, by weight, and the balance of Fe and inevitable impurities, and satisfying 0.02 to 0.04% (C + N) by weight.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP36049398 | 1998-12-18 | ||
JP36049398A JP3620319B2 (en) | 1998-12-18 | 1998-12-18 | Martensitic stainless steel with excellent corrosion resistance and weldability |
PCT/JP1999/007067 WO2000037700A1 (en) | 1998-12-18 | 1999-12-16 | Martensitic stainless steel |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1143024A1 EP1143024A1 (en) | 2001-10-10 |
EP1143024A4 EP1143024A4 (en) | 2002-08-07 |
EP1143024B1 true EP1143024B1 (en) | 2005-11-30 |
Family
ID=18469643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99959849A Expired - Lifetime EP1143024B1 (en) | 1998-12-18 | 1999-12-16 | Martensitic stainless steel |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1143024B1 (en) |
JP (1) | JP3620319B2 (en) |
DE (1) | DE69928696T2 (en) |
NO (1) | NO20012962D0 (en) |
WO (1) | WO2000037700A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1317649B1 (en) * | 2000-05-19 | 2003-07-15 | Dalmine Spa | MARTENSITIC STAINLESS STEEL AND PIPES WITHOUT WELDING WITH IT PRODUCTS |
JP3797118B2 (en) * | 2001-02-23 | 2006-07-12 | Jfeスチール株式会社 | Low Mo type corrosion resistant martensitic stainless steel |
JP2005531414A (en) * | 2001-06-29 | 2005-10-20 | マッククリンク,エドワード,ジェイ. | Seam welded air quenchable steel pipe |
US7540402B2 (en) | 2001-06-29 | 2009-06-02 | Kva, Inc. | Method for controlling weld metal microstructure using localized controlled cooling of seam-welded joints |
US7618503B2 (en) | 2001-06-29 | 2009-11-17 | Mccrink Edward J | Method for improving the performance of seam-welded joints using post-weld heat treatment |
JP4951564B2 (en) | 2008-03-25 | 2012-06-13 | 住友化学株式会社 | Regenerated sulfur recovery unit |
WO2012140718A1 (en) | 2011-04-11 | 2012-10-18 | エヌケーケーシームレス鋼管株式会社 | Highly corrosion-resistant martensitic stainless steel |
MX2020002857A (en) * | 2017-09-29 | 2020-07-24 | Jfe Steel Corp | Oil well pipe martensitic stainless seamless steel pipe and production method for same. |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03120337A (en) * | 1989-10-03 | 1991-05-22 | Sumitomo Metal Ind Ltd | Martensitic stainless steel and its manufacture |
JPH05156409A (en) * | 1991-11-29 | 1993-06-22 | Nippon Steel Corp | High-strength martensite stainless steel having excellent sea water resistance and production thereof |
JP3106674B2 (en) * | 1992-04-09 | 2000-11-06 | 住友金属工業株式会社 | Martensitic stainless steel for oil wells |
US5496421A (en) * | 1993-10-22 | 1996-03-05 | Nkk Corporation | High-strength martensitic stainless steel and method for making the same |
JP2953303B2 (en) * | 1994-05-13 | 1999-09-27 | 住友金属工業株式会社 | Martensite stainless steel |
WO1996003532A1 (en) * | 1994-07-21 | 1996-02-08 | Nippon Steel Corporation | Martensitic stainless steel having excellent hot workability and sulfide stress cracking resistance |
JP3156170B2 (en) * | 1994-07-26 | 2001-04-16 | 住友金属工業株式会社 | Martensitic stainless steel for line pipe |
JP3243987B2 (en) * | 1995-11-08 | 2002-01-07 | 住友金属工業株式会社 | Manufacturing method of high strength and high corrosion resistance martensitic stainless steel |
JPH09291344A (en) * | 1996-02-26 | 1997-11-11 | Nippon Steel Corp | Low hardness martensitic stainless steel |
JP3533055B2 (en) * | 1996-03-27 | 2004-05-31 | Jfeスチール株式会社 | Martensitic steel for line pipes with excellent corrosion resistance and weldability |
JPH09327721A (en) * | 1996-06-11 | 1997-12-22 | Nkk Corp | Production of martensitic stainless steel welded tube excellent in weldability |
JP3417219B2 (en) * | 1996-07-12 | 2003-06-16 | 住友金属工業株式会社 | Martensitic stainless steel with excellent hot workability |
JPH10204587A (en) * | 1997-01-21 | 1998-08-04 | Nkk Corp | High cr steel for line pipe, excellent in sulfide stress corrosion cracking resistance |
-
1998
- 1998-12-18 JP JP36049398A patent/JP3620319B2/en not_active Expired - Lifetime
-
1999
- 1999-12-16 EP EP99959849A patent/EP1143024B1/en not_active Expired - Lifetime
- 1999-12-16 DE DE69928696T patent/DE69928696T2/en not_active Expired - Lifetime
- 1999-12-16 WO PCT/JP1999/007067 patent/WO2000037700A1/en active IP Right Grant
-
2001
- 2001-06-15 NO NO20012962A patent/NO20012962D0/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
NO20012962L (en) | 2001-06-15 |
EP1143024A1 (en) | 2001-10-10 |
DE69928696T2 (en) | 2006-08-10 |
WO2000037700A1 (en) | 2000-06-29 |
JP3620319B2 (en) | 2005-02-16 |
DE69928696D1 (en) | 2006-01-05 |
EP1143024A4 (en) | 2002-08-07 |
JP2000178697A (en) | 2000-06-27 |
NO20012962D0 (en) | 2001-06-15 |
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